https://support.microsoft.com/en-gb/topic/kb3137779-fix-assertion-failure-on-secondary-replica-when-you-use-alwayson-availability-groups-in-sql-server-2014-18092427-f651-a4ce-df93-06a20ab1122d
KB3137779 - FIX: Assertion failure on secondary replica when you use AlwaysOn Availability Groups...
Fixes an issue that triggers an assertion failure when you use AlwaysOn Availability Groups feature in SQL Server 2014.